Engineer&#39;s drafting scale



Jan. 20, 1925. 1,523,919

C'. J. VITEK ET AL ENGINEERS DRAFTING SCALE Filed Aug. 4, 1922 Illhll'lllllhl INVENTOR. Char/es J, l/f'e/f,

By Hemy O. Schu/tz' )Si l P039 d.' Merram' M u eb y.. ATToRNEl/.

Patented Jan. 20, 1925.

UNITED STATES PATENT OFFICE.

CHARLES J'. VITEK AND HENRY O. SCHULTZ, 0F MILWAUKEE, AND ROGER J. MER- RIAM, F COLUMBUS, WISCONSIN; SAID MER-BIAM ASSIGNOB T0 PETER J. DRIES,

JB., 0F MILWAUKEE, WISCONSIN.

ENGDIEEBS DRAFTING SCALE.

Application led August 4, 1922. Serial No. 579,743.

To all whom t mary concern.'

Be it known that we, CHARLES J. Vlrnlr and HENRY O. SoHUL'rz, residinvg in the city of Milwaukee and State of isconsin,

u and ROGER J. MERRIAM, residing in the city of Columbus, in the county of Columbia and State of Wisconsin, all citizens of the United States, have invented certain new and useful Improvements in Engineers Drafting Scales; and We do declare the following to be a clear, exact, and complete descriptlon thereof, such as will ena le persons skilled in the art to which the invention pertains to make and use the same, reference being had to the accompanying drawing for an exposition of a construction in which our invention has been embodied.

The invention relates to transparent scales formed and graduated to meet the requirements of engineering and other other draftsmen, and comprises an imroved construction of such devices wherey the range of its possible uses is greatly enlarged, as will be specifically pointed out 26 hereinafter.

The invention further comprises a transparent scale on which the graduations are placed upon the reverse side thereof so as to enable a more accurate registration and ao measurement to be obtained when the scale is laid upon the paper, it being possible by this means to determine exact proportions by bringing such graduations into registry with any marks already indicated upon the paper.

he novelty of the invention will be pointed out in the appended claim.

In the accompanyin drawing:

Figure 1 is a plan vlew of our improved scale.

Figure 2 is a pers ective view of a portion of the lower ge thereof, indicating the arrangement of the graduations as they appear upon the underside of the transparent scale.

Fig. 3 a perspective view, similar to Fig. 2, of the reverse side of the scale.

The improved transparent scale constructed in accordance with our invention is formed as a trian le 10, havin a base 11, the side 12 at a rig t angle to t e base 11, and the side 13, the latter forming an angle of O with the base 11 and side 12. The base 11 is extended so as to provide a scale 14 formed as a part of the base, the free end 15 of such extension being inclined at an angle of 30, and the apex 16 of the triangle inclined at the corresponding side to present a base having a bearing of appreciable linear contact when used in certain relations. The scale may be employed for the production of angles of 15, 30, 45, 60", 75, and 90, as will be apparent from an inspection of its formation. 'The parallel edges of the extension 14 of the base 11, an the side 12, form a square having two ruling edges at a right angle to each other, the side 12 and the upper parallel edge 17 meeting in a common vertex.

A bevel protractor 18, the base of which extends in parallelism with the side 13, is .formed in the triangle, and graduated upon its arcuate contour to permit the determination of any desired de ee of inclination. The face of the scale is provided with linear measurement indications along the ruling edges, those leading from the common vertex extending op ositely therefrom ip continuation of the in ications along the e es.

he graduations Iforming the sub-divisions of the linear indications upon the face of the scale are placed u on the under side of the scale, so as to be iscernible through the transparent material of which the scale is constituted. This feature of the construction enables the graduations to be brought into exact registry with positions already indicated upon the paper, and con# duces to greater accuracy 1n arranging the scale with res ect to such positions.

In line witli the graduations which are made upon the edge 12, we provide a succession of erforations 19, the lower perforation being in the line of the common vertex, the purpose of this arrangement being to permit the scale to be employed in scribin circles, a fixed point being inserted throug the said lower perforation, and constituting the axis of rotation of the scale, a marking point bein passed into the desired perforation as in 'cated by the graduation pertaining thereto, to scribe the desired circle, when the scale is rotated upon the axis established by the fixed point.

In the drawing, the linear indications upon the face of the scale are indicated by the numeral 20, and the graduations upon the b4 @he nurneral 21,.`it elfter' @are eieay discenn-le at 'all times through the @runspfangnt `material Gi which the scale is formed. Fgr2 exempIiies 'the trainsprent sca `upon which fille lnea measurement indications 2() and the graduations 21 are shown in their relative positions.

HavingA thus described our invention, what we claim and desire to secure by Lettes Patent of the United States is:-

A 'izmnspamm-drtng scale fofxmed as a lightnglenngle *with an extended-1. base, the free end -o the :base sind the a of the tniangle .having a right line nclmation to provide an extended -li'near 'bearing when our names at Waukesha, this 1st day of 25 August, 1922.

GHAS. J. VITEK.

O. SCHULTZ. ROGER J. MEER-IAM. fitnessesz lLIN LANTERS,

A. J. GETERBEN.

the underside thereof b the numeral 21, it being understood that e latter are clearly discernible at all times through the transparent material of which the scale is formed. Fig-2 exemplifies the transparent scale upon which the linear measurement indications 20 and the graduations 21 are shown in their relative positions.

Having thus described our invention, what We claim and desire to secure by Lettes Patent of the United States is A transparent drafting scale formed as a right angle triangle with an extended base, the free end of the base and the apex of the triangle having a right line incllnation to provide an extended linear bearing when our names at 1Waukesha, this 1st day of 25 August, 1922.

CHAS. J. VITEK. HENRY O. SCHULTZ. ROGER J. MERRIAM. lVitnesses:

LIN LANTERS, A. J. Gn'rnnsnx.

Certificate of Correction.

It is herebv certified that in Letters Patent No. 1,523,919, granted January 20, 1925, upon the application of Charles J. Vitek and Henry 0. Schultz, of Mil- Waukee, and Roger J. Merriam, of Columbus, Visoonsin, for an improvement in Engineers Drafting Scales, errors appear in the printed specification requiring correction as follows: Page 2, line 12, before the article A insert the numeral 1. same page, after line 23 insert the following as claim 2:

2. A transparent drafting scale formed as a night angle triangle 'with an extended base, the free end of the base and the apen of the triangle haring a night line 'inclination to provide an emtendell linear bearing when, the inclined end and apex are employed as a base for measurements by `the scale, the scale being pro- 'vided with suitable graduations along the nner edge of the etended base and the ad'acent edge of the triangle, such grada/ations naming a. common venten: and

emtend'ng therefrom in continuation 'of the edge grasmat and that the said Letters Patent should be read with these oorrections therein that the same may conform to the record of the oase in the Pat/ent Olioe.

Signed and sealed this 5th day of May, A. D. 1925.

[sun] KARL FENNING, Acting Commissioner of Patents.

Certificate of Correction.

It is hereb certified that in Letters Patent No. 1,523,919, granted January 20, 1925, upon tlie application of Charles J. Vitel( and Henry 0. Schultz, of Milwaukee, and Roger J. Merriam, of Columbus, Wisconsin, for an improvement in Engineers Drafting Scales, errors appear in the prind specification requiring correction as follows: Page 2, line 12, before the article A insert the numeral 1.,' same page, after line 23 insert the following as claim 2:

2. A tramparent drafting scale formed as a right angle triangle 'with an ea:- tended base, the free end of the base and the apea: of the triangle haring a right line inclination to provide an extended linear bearing when the 'inclined end and apex are employed as a base for measurements by the scale, the scale being prolvided with suitable graduatonx along the nner edlgle of the etended base and the ad 'ao-ent edge of the triangle, auch graduation@ (wing a common 'vertex and etendlng therefrom 'in continuation 'of the edge graduatiom.; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent O.

Signed and sealed this 5th day of May, A. D. 1925.

[SEAL] KARL FENNING,

Acting Commissioner of Patents. 

